linux-kernel - Re: [PATCH 14/39] union-mount: Union mounts documentation

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Date:	Wed, 18 Aug 2010 10:23:52 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Valerie Aurora <vaurora@...hat.com>
Cc:	Neil Brown <neilb@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Miklos Szeredi <miklos@...redi.hu>,
	Jan Blunck <jblunck@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 14/39] union-mount: Union mounts documentation

Valerie Aurora:
> and at least three national lab computer clusters.  The best argument
> for their need for a union file system is that they are using unionfs
> and aufs despite the pain of using out-of-mainline code and (according
> to the users I have spoken to) frequent crashes.  Union mounts is

Hmm, anyone who meets crash in aufs, please let me know.
While I never say aufs is bug-free, I don't receive such report
recently. I always try fixing a bug as soon as possible when I got a
report.

A reply I have to write repeatedly to who have met a problem in aufs and
reported to aufs-users ML, is "your aufs version is too old. please get
the latest one."
Because aufs is released every week and some linux distributions keep
using very old aufs version, even over one year old version than thier
release date.

By the way, I don't have objection to merge Val's UnionMount into
mainline as I have heard it is already decided.

> But frankly, this is an impossible problem to solve generically at the
> file system level.  When a user says, "Show the changes to the lower
> file system in my overlaid file system," they are actually saying,

Is it (mostly) possible by receiving a notification via fsnotify?
For remote FS, their ->d_revalidate() will tell us something is changed.

J. R. Okajima
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